文献类型：期刊文献

英文题名：A novel in-situ hydrolysis approach to prepare ultra-selective and ultrasmooth nanofiltration membrane for efficient and sustainable ion separation

作者：Li, Xuesong[1];Chen, Xiaolan[2];Loh, Chun Heng[3];Fu, Kunkun[4];Yang, Linyan[2]

机构：[1]Tongji Univ, Shanghai Inst Pollut Control & Ecol Secur, Sch Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[3]Ngee Ann Polytech, Environm & Water Technol Ctr Innovat EWTCOI, Singapore 599489, Singapore;[4]Tongji Univ, Sch Aerosp Engn & Appl Mech, Shanghai 200092, Peoples R China

年份：2024

卷号：694

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20240315397334);WOS:【SCI-EXPANDED(收录号:WOS:001162431100001)】；

基金：This work is supported by National Natural Science Foundation of China (Grant No. 52100103 and 52100085) . The Fundamental Research Funds for the Central Universities and the Foundation of State Key Laboratory of Pollution Control and Resource Reuse (Tongji University) (Grant No. 2022-4-YB-04) are also acknowledged.

语种：英文

外文关键词：Nanofiltration; Ion separation; In situ hydrolysis; Reaction rate; Antifouling

摘要：Nanofiltration (NF) membranes are increasingly recognized for their proficiency in monovalent/divalent ion separation, making them highly suitable for application such as water softening and resource recovery. This study introduces an innovative in-situ hydrolysis method to enhance the ion selectivity of thin-film composite nanofiltration (TFC-PA NF) membranes. In this method, the reactive monomer in the oil phase was prehydrolyzed by contacting with water, producing a partially hydrolyzed monomer that remained soluble in the oil phase. This in-situ hydrolysis process introduced more carboxylic groups to the membrane. That could lead to a proper enlargement of the pore size, subsequently facilitating the separation of Cl-/SO42- . Additionally, the hydrolysis altered the polarity of the acyl chloride molecule, prompting its accumulation at the oil/water interface and accelerating the polymerization reaction rate. This resulted in a thin and exceptionally smooth PA layer. The resulting membrane exhibited a remarkable Cl-/SO42-separation factor of -316 under moderate feed concentration and -478 under high feed concentration, while maintaining decent water permeance (14.4 L m- 2 h-1 bar-1). Moreover, its maintained surface carboxylic group density, combined with ultra-low surface roughness, offered drastically enhanced fouling resistance. Our study illuminates the pathway for a straightforward and scalable method to fabricate highly selective membranes with superior fouling resistance.